Balance beads

They have a chart for classic cars. They list a 185 70 14 then a 205 75 14. I was wondering about a 195 75 14 so I e-mailed them about it as per the website. I got a reply that said what car is it so I told them 1977 Dodge Aspen. They said it might not be heavy enough. So I e-mailed them back and said according to your chart, which says nothing about vehicle weight. I can run them in my Fifth Avenue with 225 75 15's but not in my Aspen when both cars weigh roughly the same. I then replied, I don't really understand the science behind this but my 4000 lb car is to light, yet you want me to run them in my 1000 lb bike? I doubt I will get a reply but this bead thing has killed a few hours at work.